docs: def is_mixed_script(string, allowed_aliases=['COMMON']):
      """Checks if ``string`` contains mixed-scripts content, excluding script
      blocks aliases in ``allowed_aliases``.
  
      E.g. ``B. C`` is not considered mixed-scripts by default: it contains characters
      from **Latin** and **Common**, but **Common** is excluded by default.
  
      >>> confusables.is_mixed_script('Abç')
      False
      >>> confusables.is_mixed_script('ρτ.τ')
      False
      >>> confusables.is_mixed_script('ρτ.τ', allowed_aliases=[])
      True
      >>> confusables.is_mixed_script('Alloτ')
      True
  
      :param string: A unicode string
      :type string: str
      :param allowed_aliases: Script blocks aliases not to consider.
      :type allowed_aliases: list(str)
      :return: Whether ``string`` is considered mixed-scripts or not.
      :rtype: bool
      """
      allowed_aliases = [a.upper() for a in allowed_aliases]
      cats = unique_aliases(string) - set(allowed_aliases)
      return len(cats) > 1